Correct Answer: Option B
Let the thickness of the bottom be x cm.
Then, [(330 - 10) x (260 - 10) x (110 - x)] = 8000 x 1000
=> 320 x 250 x (110 - x) = 8000 x 1000
=> (100 – x) = (8000 x 1000) / (320 x 250) = 100
=> x = 10 cm = 1 dm
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